Derivatives - Additional Information (Detail) - USD ($)	3 Months Ended
Sep. 30, 2016	Jun. 30, 2016
Derivative [Line Items]
Maximum length of time hedged in cash flow hedge	3 years
Minimum required liquidity under certain counterparty agreements	$ 1,000,000,000
Minimum liquidity for the period as defined by certain counterparty agreements	1,000,000,000
Estimated derivative net gains (losses) included in AOCI that will be reclassified into earnings within 12 months	$ 289,000,000
Senior Unsecured Obligations
Derivative [Line Items]
Debt instrument credit rating	AAA
Derivatives Sold \| Equity Contracts
Derivative [Line Items]
Notional amounts	$ 2,500,000,000	$ 2,200,000,000
Derivatives Sold \| Designated Hedge Derivatives \| Equity Contracts
Derivative [Line Items]
Notional amounts	986,000,000	986,000,000
Derivatives Sold \| Non-designated Hedge Derivatives \| Foreign Exchange Contracts
Derivative [Line Items]
Notional amounts	5,400,000,000	11,700,000,000
Derivatives Sold \| Non-designated Hedge Derivatives \| Interest Rate Contracts
Derivative [Line Items]
Notional amounts	2,200,000,000	2,400,000,000
Derivatives Sold \| Non-designated Hedge Derivatives \| Credit Contracts
Derivative [Line Items]
Notional amounts	271,000,000	273,000,000
Derivatives Sold \| Non-designated Hedge Derivatives \| Commodity Contracts
Derivative [Line Items]
Notional amounts	195,000,000	162,000,000
Derivatives Sold \| Cash flow hedging \| Foreign Exchange Contracts
Derivative [Line Items]
Notional amounts	8,500,000,000	8,400,000,000
Derivatives Sold \| Fair value hedging \| Foreign Exchange Contracts
Derivative [Line Items]
Notional amounts	5,200,000,000	5,300,000,000
Derivatives Purchased \| Equity Contracts
Derivative [Line Items]
Notional amounts	1,800,000,000	1,300,000,000
Derivatives Purchased \| Designated Hedge Derivatives \| Equity Contracts
Derivative [Line Items]
Notional amounts	737,000,000	737,000,000
Derivatives Purchased \| Non-designated Hedge Derivatives \| Foreign Exchange Contracts
Derivative [Line Items]
Notional amounts	8,600,000,000	12,000,000,000
Derivatives Purchased \| Non-designated Hedge Derivatives \| Interest Rate Contracts
Derivative [Line Items]
Notional amounts	327,000,000	328,000,000
Derivatives Purchased \| Non-designated Hedge Derivatives \| Mortgage-backed securities
Derivative [Line Items]
Notional amounts	546,000,000	548,000,000
Derivatives Purchased \| Non-designated Hedge Derivatives \| Credit Contracts
Derivative [Line Items]
Notional amounts	384,000,000	440,000,000
Derivatives Purchased \| Non-designated Hedge Derivatives \| Commodity Contracts
Derivative [Line Items]
Notional amounts	$ 623,000,000	$ 631,000,000

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The minimum liquidity for the period as required by certain of our counterparty agreements for derivative instruments.

+ References

No definition available.

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- Definition

The minimum liquidity required by certain of our counterparty agreements for derivative instruments.

+ References

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- Definition

Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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- Definition

Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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